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Brutal whump idea:
A large ring pierced through Whumpee’s mouth, below their tongue and straight through their jaw. A chain hooked to that, and used to drag them around like on a leash, tugging whenever they’re moving too slow.
Not only the pain, but it works as a permanent gag. Maybe it goes through their tongue as well. They can’t speak right. They can’t eat. Any sound comes out as a pathetic whine. They can’t close their mouth, maybe their hands are bound behind them so they can do nothing about the blood and saliva dripping down their chin.
The only thing that matters is that they certainly won’t be mouthing off to Whumper again.